12868561 has 2 divisors, whose sum is σ = 12868562. Its totient is φ = 12868560.

The previous prime is 12868543. The next prime is 12868571. The reversal of 12868561 is 16586821.

12868561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 1465-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7392961 + 5475600 = 2719^2 + 2340^2 .

It is an emirp because it is prime and its reverse (16586821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12868561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12868561.

It is not a weakly prime, because it can be changed into another prime (12868501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6434280 + 6434281.

It is an arithmetic number, because the mean of its divisors is an integer number (6434281).

Almost surely, 2^12868561 is an apocalyptic number.

It is an amenable number.

12868561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12868561 is an equidigital number, since it uses as much as digits as its factorization.

12868561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 12868561 is about 3587.2776586152. The cubic root of 12868561 is about 234.3383288641.

The spelling of 12868561 in words is "twelve million, eight hundred sixty-eight thousand, five hundred sixty-one".